Adding Interactive Data Language (IDL) support.

samples/IDL/mg_gcd.pro

@@ -0,0 +1,35 @@
+; docformat = 'rst'
+
+;+
+; Find the greatest common denominator (GCD) for two positive integers.
+; 
+; :Returns:
+;    integer
+;
+; :Params:
+;    a : in, required, type=integer
+;       first integer
+;    b : in, required, type=integer
+;       second integer
+;-
+function mg_gcd, a, b
+  compile_opt strictarr
+  on_error, 2
+  
+  if (n_params() ne 2) then message, 'incorrect number of arguments'
+  if (~mg_isinteger(a) || ~mg_isinteger(b)) then begin
+    message, 'integer arguments required'
+  endif
+  
+  _a = abs(a)
+  _b = abs(b)
+  minArg = _a < _b
+  maxArg = _a > _b
+  
+  if (minArg eq 0) then return, maxArg
+  
+  remainder = maxArg mod minArg
+  if (remainder eq 0) then return, minArg
+  
+  return, mg_gcd(minArg, remainder)
+end